What is often the purpose of a "floater" in cocktails?

A floater in cocktails is primarily used to create a visually appealing layer. This technique involves carefully pouring a spirit or liqueur on top of a finished cocktail so that it doesn't fully mix with the ingredients below. The result is a distinct separation that enhances the drink's appearance, making it more visually interesting and inviting. This layering can showcase different colors and textures, contributing to the overall aesthetic of the cocktail.

While introducing new flavors is also a benefit of using a floater, the main emphasis in cocktail presentation is often on visual appeal. Additionally, floaters do not serve to dilute the drink or chill it faster; rather, they maintain the integrity and flavor profile of the original cocktail while adding an artful flourish.